Respostas
respondido por:
3
A)
3x/2 + y = 15
x - y = 5
3x + y = 15
-----
2
3x + 2y = 30
----------- --------
2 2
3x + 2y = 30
x - y = 5 (2)
3x + 2y = 30
2x - 2y = 10 (+)
--------------------------
5x = 40
x = 40/5
x = 8
x - y = 5
8 - y = 5
8 - 5 = y
3 = y
y = 3
*********************************
B)
y = 2x
x - y = 0
x - y = 0
x = y
x = 2x
0 = 2x - x
0 = x
x = 0
x - y = 0
x = y
0 = y
y = 0
*************************************
C)
3x - y = 18
x + y = 10 (+)
---------------------
4x = 28
x = 28/4
x = 7
x + y = 10
7 + y = 10
y = 10 - 7
y = 3
3x/2 + y = 15
x - y = 5
3x + y = 15
-----
2
3x + 2y = 30
----------- --------
2 2
3x + 2y = 30
x - y = 5 (2)
3x + 2y = 30
2x - 2y = 10 (+)
--------------------------
5x = 40
x = 40/5
x = 8
x - y = 5
8 - y = 5
8 - 5 = y
3 = y
y = 3
*********************************
B)
y = 2x
x - y = 0
x - y = 0
x = y
x = 2x
0 = 2x - x
0 = x
x = 0
x - y = 0
x = y
0 = y
y = 0
*************************************
C)
3x - y = 18
x + y = 10 (+)
---------------------
4x = 28
x = 28/4
x = 7
x + y = 10
7 + y = 10
y = 10 - 7
y = 3
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